Well, how about that? Gotham says it finally has a way to grade its teachers — and maybe even fire those who can’t teach.

If so, it’d be a step in the right direction — for a city where snow falls in July more often than incompetent teachers get booted. The problem is, it’ll be years before anyone knows if the plan will truly make a difference.

Under the new scheme, teachers who need help will get it, but teachers deemed “ineffective” two years in a row face dismissal.Will it work? The test is whether the number of fired teachers climbs notably. After all, seven in 10 city kids now graduate unprepared for a job or college, according to state standards. And yet, out of 75,000 teachers, only 11 were sent packing for incompetence last year. That’s right: 11. Surely more deserve pink slips than that, no?

So count us skeptical about key provisions of this new plan, especially when union boss Mike Mulgrew is boasting that it gives teachers more protections and additional say about evaluations.

The best measure will be how much the kids themselves improve. And if the new grading scheme really does its job, the huge lines for seats at charters might dwindle.

These alternative schools, by the way, will keep the pressure on their traditional counterparts. The best teacher-evaluation system, after all, is one that makes it easy for parents to choose different teachers — by choosing different schools.